The organisation says these countries should suspend deliveries of arms, if they thought it was likely they would be used "for grave human rights violations".

A group of six aid agencies have also called for action, saying that previous UN resolutions "mounted to little more than empty threats, with minimal impact on the levels of violence".

HRW on Monday accused the rebels in Darfur of violating the agreed ceasefire, saying they had "abducted civilians, attacked police stations and other government institutions and raided and looted substantial numbers of livestock and commercial goods".

Attack

On Sunday, the BBC's Panorama programme revealed new evidence of mass ethnic killings and rape in Darfur, adding to fears of genocide in the region.

In one town that the BBC team visited, at least 80 children had been killed, as well as many adults.

DARFUR VIOLENCE

An Arab-looking man, in a uniform with military insignia, stopped his car next to me. He grabbed my son from me and threw him into a fire

It is now estimated that more than 70,000 people have died in Darfur and massacres are still going on.

Survivors told the BBC one by one about which family members they had lost.

At least 80 children had been killed.

There were four mass grave sites on the town's fringes.

Sudan's government insists that the killings are the result of tribal chaos in the region. However, African Union observers in Darfur say the government has been arming and directing the Janjaweed militia.

America has called the killings in Darfur genocide because of their ethnic nature.

Britain and many other nations are waiting for the outcome of a lengthy UN investigation into the subject.